I haven't had a serious look yet but this appears not to be an AC motor but a stepper motor. There is lots you can find on stepper motor drive circuits. Your circuit probably has errors as the series connection of caps seems silly.

Provedl jsem průzkum, jak to je s řízením otáček u Pro-jectu, no je to jednodušší než se na první pohled zdá. I have a survey, how it is in the driving speed in Pro-jectu, no it's easier than it seems at first glance.

Takže není konec starým strojům, Pro-ject nemá koncové vypínání, antiskating se závažíčkem, au levnějších verzí talíř MDF nebo ocel. So it is not the end of the old machines, Pro-ject does not end shutdown, antiskating the závažíčkem, and cheaper versions of MDF or steel plate. plech. plate.